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Title |
Stress Measurement of Structural Member Using Piezoelectric Property
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Keywords |
응력측정방법 ; 응력분포측정 Tape ; 압전 특성 ; 표면전위계 ; PVDF필름 Stress measurement method ; Piezoelectric property ; Electrostatic voltmeter ; PVDF |
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Abstract |
A stress measurement method of structural member using piezoelectric property and electrostatic voltmeter is presented. The electric potentials of the surface of the piezoelectric element, which are proportional to the strain ε on the structural member, are measured by an electrostatic voltmeter during load cycling. The stress σ is calculated by this strain ε. Moreover, a stress distribution measurement tape which can be used for the stress distribution measurement along a specified line on the surface of structural member is developed, and the surface potential was measured by an electric static voltmeter of non-contact type. The applicability of the stress distribution measurement tape is examined through experiments using a notched specimen under cyclic loading. The measured distributions of x, y and xy are compared with those calculated by FEM analysis.
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